This is Mazaev, A member of Charlotta and good friends with Adrik and Kazimir. He is a total flirt and people who don't know him very well call him "creeper" and such. It appears he may have a thing for Decora but he actually likes someone else.
Here's a short bio:
Grew up with his best friend Adrik and when he reached junior high, he met Kazimir and by the time he dropped out of high school with them, he joined Gravel. After a bunch of BS between Kazimir and Zarubin, he, along with Adrik, helped Kazimir start Charlotta.
© Mazaev: Me